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Dir X3260 FirmwareOperating system · Dlink

CVE-2023-44418

HIGH · 8.8 CVSS v3.1 Published 2024-05-03
Fix available
A fix is available. Upgrade to 1.04b01 or later.
See remediation →
93/100
Remediation priority · Urgent
No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
D-Link DIR-X3260 Prog.cgi Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DIR-X3260 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the prog.cgi binary, which handles HNAP requests made to the lighttpd webserver. The issue results from the lack of proper validation of the length an user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-20727.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A heap-based buffer overflow vulnerability exists in the prog.cgi binary of D-Link DIR-X3260 routers. The flaw stems from insufficient validation of user-supplied data length before copying into a fixed-size heap buffer when handling HNAP requests on the lighttpd webserver. This allows unauthenticated network-adjacent attackers to achieve arbitrary code execution with root privileges.

MitigationApply the vendor firmware update when available; meanwhile, disable remote administration interfaces, restrict network access to management ports, and consider replacing affected devices if no patch is released.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Dir X3260 FirmwareOperating system
Affected:< 1.04b01

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm router model
    Access the router admin interface or check the device label to verify the exact model is D-Link DIR-X3260
    Affected if The device is not a DIR-X3260 model
  2. Check firmware version
    Log into the router web interface (typically at 192.168.0.1) and navigate to the Status or Management page to view the current firmware version, or check via CLI if available
    Affected if Firmware version is anything before 1.04b01 (e.g., 1.04b00, 1.03, etc.)
  3. Verify lighttpd webserver is active
    Attempt to access the router's web interface on ports 80 or 443 from the local network. The vulnerability exists in the lighttpd webserver component handling requests
    Affected if The web interface is accessible and responding to HTTP/HTTPS requests
  4. Confirm HNAP endpoint is reachable
    Send an HTTP request to the /HNAP1/ endpoint on the router (e.g., curl http://192.168.0.1/HNAP1/). The buffer overflow occurs when prog.cgi processes HNAP requests
    Affected if The /HNAP1/ endpoint returns any response (indicating HNAP is enabled)
  5. Check remote administration exposure
    Determine if the router's web interface is accessible from outside the local network by checking port forwarding rules, firewall settings, or attempting access from an external IP
    Affected if Remote administration is enabled and the web interface is reachable from outside the local network

You are affected if you have a D-Link DIR-X3260 router running firmware versions prior to 1.04b01 with the lighttpd webserver and HNAP functionality enabled and accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.04b01 or later
Fixed in 1.04b01
Interim mitigation

Apply the vendor firmware update when available; meanwhile, disable remote administration interfaces, restrict network access to management ports, and consider replacing affected devices if no patch is released.

Recommended fix Moderate confidence

D-Link DIR-X3260 Firmware version 1.04b01 or later

  1. Navigate to D-Link's official support website and download firmware version 1.04b01 or later for the DIR-X3260 router
  2. Access the router's web management interface by entering the router's IP address in a web browser
  3. Log into the router administration panel with administrative credentials
  4. Locate the firmware upgrade section (typically under 'Management', 'System', or 'Tools' settings)
  5. Upload the downloaded firmware file and initiate the upgrade process
  6. Wait for the firmware upgrade to complete and the router to reboot automatically
  7. Verify the firmware version has been updated by checking the router's status page

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Dir X3260 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-44418 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data